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Projects

Grants by the Latvian Council of Science

  • Latvian Council of Sciences grant No. 04.1219. “Importance of sperm chromatin structure in male fertility: assessment methodology and dependence on the environmental, lifestyle-related, and genetic factors”. Duration: 2004–2008
  • Latvian Council of Sciences grant No. 233/2012 “Importance of functional diagnostics of plasma membrane Ca2+ ATPase 4 in male infertility”. Duration: 2013–1016

Market-oriented Research of the Ministry of Education and Science

  • TOP No. 04-01 project “Importance of selenium in prophylaxis and treatment of male infertility in Latvia”. Duration: 2004–2005
  • TOP No. 06-21 project “Development of new methods for diagnosing male infertility”. Duration: 2006–2009

EU Framework Programme projects

  • EU 5-FP project No. QLK4-1999-01422 “Envir.Reprod.Health”. Duration: 2002–2004. Result: Study of reproductive parameters and factors affecting it of young males from the general Latvian population.

Publications

2013

  • M. Punab, M. Grigorova, O. Poolamets, S.Sober, V.Vihlajev, B. Zilaitiene, J. Erenpreiss, V. Matulevicius, I. Tsarev, M. Laan. Study in 1790 Baltic men: FSHR Asn680Ser polymorphism affects total testes volume. Andrology, 2013, 1(2):293-300.

2012

  • M. Buividaite, J. Erenpreiss. The effect of treatment with antioxidants/vitamīns/aminoacids on semen quality in idiopathic infertile males. Journal of Reproductive Medicine and Endocrinology, Vol. 9, N 5, 2012, P28, p.366. Abstracts of the 7th European Congress of Andrology (Berlin, Germany, Nov 28 – Dec 1).

2011

  • Grigorova, M, Punab, M, Zilaitiene, B, Erenpreiss, J, Ausmees, K, Matulevicius, V, Tsarev, I, Jorgensen, N, Laan, M.: Genetically Determined Dosage of Follicle-Stimulating Hormone (FSH) Affects Male Reproductive Parameters. J. Clin. Endocrinol. Metab. Vol. 96, pp. E1534-E1541, 2011
  • I. Tsarev, J. Erenpreiss. Cytochemical tests for sperm chromatin maturity. In: Zini A, Agarwal A, eds, Sperm Chromatin: Biological and Clinical Applications in Male Infertility and Assisted Reproduction, New York, Springer, 2011, pp. 181-188.
  • Puzuka, A., Pronina, N, Grinfelde, I, Erenpreiss, J, Lejing, V, Bars, J, Pliss, L, Pelnena, I, Baumanis, V, Krumina, A.: Y chromosome-a tool in infertility studies of Latvian population. Russ. J. Genet. Vol. 47, pp. 347 - 353, 2011.
  • J. Erenpreiss, I. Tsarev. Differences in epigenetic regulatory mechanisms between fertile and infertile men. Fertility&Sterility, Vol. 96, N 3, Suppl. 1 (2011, Sept.), p. S167. Abstracts of the American Society for Reproductive Medicine 67th Annual Meeting (Orlando, Florida, USA, Oct. 15-19, 2011).
  • A. Puzuka, J. Erenpreiss, N. Pronina, et al. Evaluation of molecular aspects of male infertility in the Latvian population. In Vivo: International Journal of Experimental and Clinical Pathophysiology and Drug Research, Vol. 25, N 3, (2011, May-June), pp. 554-555. Abstracts of the 4th International Congress of Molecular Medicine (Istanbul, Turkey, June 27-30, 2011).

2010

  • Erenpreiss, J, Tsarev, I.: Comparison of global sperm DNA methylation in fertile and infertile men: preliminary results. Int. J. Androl. Vol. 33, pp. 49 - 49, 2010
  • Tsarev, I, Erenpreiss, J.: Global sperm DNA methylation compatison in fertile and infertile men: Preliminary results. Eur. Urol. Suppl. Vol. 9, pp. 540 - 541, 2010
  • Pozarskis, A, Erenpreiss, J, Pozarska, J.: Prevalence of late onset hypogonadism in Latvia: A preliminary study. J. Sex. Med. Vol. 7, pp. 219 - 219, 2010
  • Pozarskis A., Erenpreiss J.: Late-onset hypogonadism: Review of the problem. Proceedings of the Latvian Academy of Sciences, Section B: Natural, Exact, and Applied Sciences Vol. 64, pp. 93 - 97, 2010
  • A. Puzuka, N. Pronina, J. Erenpreiss, V. Lejins, L. Pliss, V. Baumanis, A. Krumina. Y chromosome microdeletion and haplogroup patterns in Latvian population. 4th Utah/Florence Symposium on the Genetics of Male Infertility, 4-6 February, 2010, Utah, USA. Abstracts, p. 55.

2009

  • Tsarev, I, Bungum, M, Giwercman, A, Erenpreisa, J, Ebessen, T, Ernst, E, Erenpreiss, J: Evaluation of male fertility potential by Toluidine Blue test for sperm chromatin structure assessment. Hum. Reprod. Vol. 24, pp. 1569 - 1574, 2009
  • Mahfouz, RZ, Sharma, RK, Said, TM, Erenpreiss, J, Agarwal, A: Association of sperm apoptosis and DNA ploidy with sperm chromatin quality in human spermatozoa. Fertil. Steril. Vol. 91, pp. 1110 - 1118, 2009

2008

  • Erenpreiss, J, Elzanaty, S, Giwercman, A.: Sperm DNA damage in men from infertile couples. Asian J. Androl. Vol. 10, pp. 786 - 790, 2008
  • Erenpreiss, J, Tsarev, I, Giwercman, A., Giwercman, Y: The impact of androgen receptor polymorphism and parental ethnicity on semen quality in young men from Latvia. Int. J. Androl. Vol. 31, pp. 477 - 482, 2008
  • Puzuka, A, Krumina, A, Prane, I, Grinfelde, I, Pronina, N, Lejins, V, Erenpreiss, J, Baumanis, V: Incidence of Y chromosomal microdeletions and CFTR gene mutations in infertile males in Latvia. FEBS J. Vol. 275, pp. 100, 2008
  • Pozarskis, A, Erenpreiss, J: The epidemiology peculiarity of the premature ejaculation in the territory of Latvia, generating factors and the medical treatment possibilities. J. Sex. Med. Vol. 5, pp. 132 - 132, 2008

2007

  • Elzanaty, S, Erenpreiss, J, Becker, C: Seminal plasma albumin: origin and relation to the male reproductive parameters. Andrologia Vol. 39, pp. 60 - 65, 2007
  • Bungum M, Humaidan P, Axmon A, Spano M, Bungum L, Erenpreiss J, and     Giwercman A. Sperm chromatin conformation measurment predicts the outcome of ART. Hum Reprod, 2007, 22:1 74-9.
  • A. Puzuka, A. Krumina, J. Erenpreiss et al. Analysis of Y-chromosomal microdeletions and polymorphism of CFTR gene in infertile males – a study from Latvian population. Dosjagnenja i problemi genetiki, selekcii ta biotehnologii (sbornik nauchnih trudov). Kiiv, 2007 – T.1, 575-578.
  • Mahfouz, R, Agarwal, A, Said, TM, Erenpreiss, J, Giwercman, A, Sharma, R: Evaluation of fertility potential by toluidine blue test and the sperm chromatin structure assay. Fertil. Steril. Vol. 88, pp. S301 - S301, 2007
  • D. Ungurjana, I. Tsarev, A. Silova, J. Orbidans, T. Ebessen, E. Ernst, A. Skesteris, J. Erenpreiss. Differences in oxidative stress and seminal antioxidative capacity un relation to semen parameters in sperm donors and infertile men. Annual Scientific Conference of Riga Stradins University. March 29-30, 2007. Riga, Latvia. Abstract book, p 59.
  • J. Erenpreiss, I. Tsarev. The impact of parental ethnicity and maternally derived androgen receptor polymorphism on semen quality in young men from Latvia. Annual Scientific Conference of Riga Stradins University. March 29-30, 2007. Riga, Latvia. Abstract book, p 125.
  • A. Pozarskis, J. Erenpreiss. Epidemiological peculiarities, causative factors and treatment options of premature ejaculation in Latvia: a pilot study. Annual Scientific Conference of Riga Stradins University. March 29-30, 2007. Riga, Latvia. Abstract book, p 225.
  • A. Puzuka, A. Krumina, N. Pronina, V. Lejins, J. Erenpreiss, J. Bars, I. Grinfelde. Analysis of Y-chromosomal microdeletions in infertile males. Annual Scientific Conference of Riga Stradins University. March 29-30, 2007. Riga, Latvia. Abstract book, p 251.
  • J. Erenpreiss. Sperm chromatin structure and male infertility. Invited speaker. 2nd Workshop on Reproductive Biomedicine. May 17-19, 2007. Tartu, Estonia. Abstract book, p 17.
  • A. Puzuka, A. Krumina, J. Erenpreiss et al. Microdeletions of AZF region of Y chromosome in infertile males, a study from Latvian population. European Journal of Human Genetics. 2007, Vol. 15, Suppl. 1, 208-209. European Human Genetics Conference 2007, Nice, France, June 16-19.

2006

  • Erenpreiss, J, Bungum, M, Spano, M, Elzanaty, S, Orbidans, J, Giwercman, A: Intra-individual variation in sperm chromatin structure assay parameters in men from infertile couples: clinical implications. Hum. Reprod. Vol. 21, pp. 2061 - 2064, 2006.
  • I. Tsarev, T. Freivalds, J. Orbidans, J. Erenpreiss. Toluidine blue test for precise diagnostic of male infertility. Riga Stradins University 5th Scientific Conference. March 3, 2006, Riga Latvia. Abstract Book, p. 40.
  • I. Tsarev, J. Erenpreisa, T. Freivalds, T. Ebbesen, E. Ernst, M. Bungum, A.       Giwercman, J. Erenpreiss. A new approach to predict male fertility potential       with high precision using Toluidine Blue test: preliminary results. 14th European Workshop on the Molecular and Cellular Endocrinology of the Testis. April 22-26, 2006, Bad Aibling, Germany. Abstract book, II-36.
  • T.M. Said, A. Agarwal, J. Erenpreiss, R. Mahfouz, A. Giwercman, D.P. Evenson. Association of early apoptosis with the nuclear integrity and maturity in different seminal fractions. 62nd Annual Meeting of the American Society for Reproductive Medicine. October 21-25, 2006. New Orleans, Louisiana, USA. P-985.
  • T.M. Said, A. Agarwal, J. Erenpreiss, R. Mahfouz, A. Giwercman, D.P. Evenson. Evaluation of seminal fractions using the Toluidine blue test and sperm chromatin structure assay. 62nd Annual Meeting of the American Society for Reproductive Medicine. October 21-25, 2006. New Orleans, Louisiana, USA. P-986.
  • T.M. Said, R. Mahfouz, J. Erenpreiss, A. Giwercman, R.K. Sharma, A. Agarwal. Association of early apoptosis with the nuclear integrity and maturity in different seminal fractions. 62nd Annual Meeting of the American Society for Reproductive Medicine. October 21-25, 2006. New Orleans, Louisiana, USA. P-988.
  • R. Mahfouz, T.M. Said, J. Erenpreiss, A. Giwercman, D.P. Evenson, A. Agarwal. Comparison of DNA contents of apoptotic sperm cells in neat and     processed semen. 62nd Annual Meeting of the American Society for Reproductive Medicine. October 21-25, 2006. New Orleans, Louisiana, USA. P-989.
  • I. Tsarev, T. Ebbesen, E. Ernst. A. Giwercman, J. Erenpreiss. Toluidine Blue       image analysis cytometry for the prognosis of male fertility potential. IVth       European Congress of Andrology. December 7-10, Toulouse, France. Andrologie, 2006, Vol 16, No 4, PO 066, p.360.
  • J. Erenpreiss, I. Tsarev, A. Giwercman, Y. Giwercman. The impact of androgen receptor polymorphism and parental ethnicity on semen quality in young men from Latvia. IVth European Congress of Andrology. December 7-10, Toulouse, France. Andrologie, 2006, Vol 16, No 4, PO 032, p.338.

Accomplishments

Toluidine blue cytometry test for sperm DNA structure assessment for clarifying diagnosis of male fertility.

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